The Alkaine phosphate test is one of the components of the Liver Health Panel and is an enzyme, a protein that helps cells work. You find alkaline phosphate in high concentrations in the cells that make bone and in the liver. In the liver, it is found on the edges of cells that join to form bile ducts (tiny tubes that drain bile from the liver to the bowels where it is needed to help digest fat in the diet). Smaller amounts of ALP are found in the placenta (afterbirth) of women who are pregnant, and in the bowel. Each of these body parts makes different forms of ALP. The different forms are called isoenzymes.